package com.reggie.lotterysystem.service.mq;

import cn.hutool.core.date.DateUtil;
import com.reggie.lotterysystem.common.exception.ServiceException;
import com.reggie.lotterysystem.common.utils.JacksonUtil;
import com.reggie.lotterysystem.common.utils.MailUtil;
import com.reggie.lotterysystem.common.utils.SMSUtil;
import com.reggie.lotterysystem.controller.param.DrawPrizeParam;
import com.reggie.lotterysystem.dao.dataobject.ActivityPrizeDO;
import com.reggie.lotterysystem.dao.dataobject.WinningRecordDO;
import com.reggie.lotterysystem.dao.mapper.ActivityPrizeMapper;
import com.reggie.lotterysystem.dao.mapper.WinningRecordMapper;
import com.reggie.lotterysystem.service.DrawPrizeService;
import com.reggie.lotterysystem.service.activitystatus.ActivityStatusManager;
import com.reggie.lotterysystem.service.dto.ConvertActivityStatusDTO;
import com.reggie.lotterysystem.service.enumclass.ActivityPrizeStatusEnum;
import com.reggie.lotterysystem.service.enumclass.ActivityPrizeTiersEnum;
import com.reggie.lotterysystem.service.enumclass.ActivityStatusEnum;
import com.reggie.lotterysystem.service.enumclass.ActivityUserStatusEnum;
import jakarta.annotation.Resource;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.amqp.rabbit.annotation.RabbitHandler;
import org.springframework.amqp.rabbit.annotation.RabbitListener;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.scheduling.concurrent.ThreadPoolTaskExecutor;
import org.springframework.stereotype.Component;
import org.springframework.util.CollectionUtils;

import java.util.HashMap;
import java.util.List;
import java.util.Map;
import java.util.stream.Collectors;

import static com.reggie.lotterysystem.common.config.DirectRabbitConfig.QUEUE_NAME;

@Component
@RabbitListener(queues = QUEUE_NAME)
public class MqReceive {

    private Logger logger = LoggerFactory.getLogger(MqReceive.class);

    @Autowired
    private DrawPrizeService drawPrizeService;
    @Autowired
    private ActivityStatusManager activityStatusManager;
    @Resource
    private ThreadPoolTaskExecutor threadPoolTaskExecutor;
    @Autowired
    private MailUtil mailUtil;
    @Autowired
    private SMSUtil smsUtil;
    @Autowired
    private ActivityPrizeMapper activityPrizeMapper;
    @Autowired
    private WinningRecordMapper winningRecordMapper;

    @RabbitHandler
    public void process(Map<String, String> message){
        //成功接收到队列中的消息
        logger.info("MQ成功接收到消息，message：{}",
                JacksonUtil.writeValueAsString(message));
        String paramString = message.get("messageData");
        DrawPrizeParam param = JacksonUtil.readValue(paramString, DrawPrizeParam.class);
        //处理抽奖的流程

        try{
            //校验抽奖请求是否有效
            //1.有可能前端发起两个一样的抽奖请求，对于 param 来说也是一样的两个请求
            //2.param:最后一个奖项 ->
            //          处理 param1：活动完成，奖品完成。
            //          处理 param2：回滚活动，奖品状态。
            if (!drawPrizeService.checkDrawPrizeParam(param)){
                return;
            }

            //状态扭转处理(含有设计模式！)
            statusConvert(param);
            //保存中奖者名单
            List<WinningRecordDO> winningRecordDOList =
                    drawPrizeService.saveWinnerRecords(param);
            //通知中奖者（邮箱，短信）
            //抽奖之后的后续流程，异步（并发）处理
            syncExecute(winningRecordDOList);
        }catch (ServiceException e){
            logger.error("处理MQ消息异常！{}：{}",e.getCode(),e.getMessage(),e);
            //如果异常，需要保证事务一致性（回滚），抛出异常
            rollback(param);
            throw e;
        }catch (Exception e){
            logger.error("处理MQ消息异常！",e);
            //如果异常，需要保证事务一致性（回滚），抛出异常
            rollback(param);
            throw e;
        }

    }

    /**
     * 处理抽奖异常的回滚行为：恢复处理请求之前的库表状态
     * @param param
     */
    private void rollback(DrawPrizeParam param) {
        //1.回滚状态：活动，奖品，人员
        //是否需要回滚
        if (!statusNeedRollback(param)){
            //不需要 return
            return;
        }
        //需要回滚：回滚
        rollbackStatus(param);

        //回滚中奖者名单
        //是否需要回滚
        if (!winnerNeedRollback(param)){
            //不需要：return
            return;
        }
        //需要：回滚
        rollbackWinner(param);

    }

    /**
     * 回滚中奖记录：删除奖品下的中奖者
     * @param param
     */
    private void rollbackWinner(DrawPrizeParam param) {
        drawPrizeService.deleteRecords(param.getActivityId(),param.getPrizeId());
    }

    private boolean winnerNeedRollback(DrawPrizeParam param) {
        //判断活动中的奖品是否存在中奖者
        int count = winningRecordMapper.countByAPId(param.getActivityId(),param.getPrizeId());
        return count > 0;
    }

    /**
     * 恢复相关状态
     * @param param
     */
    private void rollbackStatus(DrawPrizeParam param) {
        //涉及状态的恢复，使用 ActivityStatusEManager
        ConvertActivityStatusDTO convertActivityStatusDTO = new ConvertActivityStatusDTO();
        convertActivityStatusDTO.setActivityId(param.getActivityId());
        convertActivityStatusDTO.setTargetActivityStatus(ActivityStatusEnum.RUNNING);
        convertActivityStatusDTO.setPrizeId(param.getPrizeId());
        convertActivityStatusDTO.setTargetPrizeStatus(ActivityPrizeStatusEnum.INIT);
        convertActivityStatusDTO.setUserId(
                param.getWinnerList()
                        .stream()
                        .map(DrawPrizeParam.Winner::getUserId)
                        .collect(Collectors.toList())
        );
        convertActivityStatusDTO.setTargetUserStatus(ActivityUserStatusEnum.INIT);
        activityStatusManager.rollbackHandlerEvent(convertActivityStatusDTO);

    }

    private boolean statusNeedRollback(DrawPrizeParam param) {
        //判断活动+奖品+人员表相关状态是否已经扭转（正常思路）
        //扭转状态时，保证了事务一致性，要么都扭转了，要么都没扭转（不包含活动）：
        //因此，只用判断人员/奖品是否扭转过，就能判断出状态是否全部扭转
        //不能判断活动是否已经扭转
        //结论：判断奖品状态是否扭转，就能判断出全部状态是否扭转
        ActivityPrizeDO activityPrizeDO =
                activityPrizeMapper.selectByAPId(param.getActivityId(), param.getPrizeId());
        //已经扭转了，需要回滚
        return activityPrizeDO.getStatus()
                .equalsIgnoreCase(ActivityPrizeStatusEnum.COMPLETED.name());
    }

    /**
     * 并发处理抽奖后续流程
     * @param winningRecordDOList
     */
    private void syncExecute(List<WinningRecordDO> winningRecordDOList) {
        //通过线程池  threadPoolTaskExecutor
        //扩展：加入策略模式或者其他设计模式来完成后续的异步操作
        //短信通知
        threadPoolTaskExecutor.execute(()->sendMessage(winningRecordDOList));
        //邮件通知
        threadPoolTaskExecutor.execute(()->sendMail(winningRecordDOList));

    }

    /**
     * 发邮件
     * @param winningRecordDOList
     */
    private void sendMail(List<WinningRecordDO> winningRecordDOList) {
        if (CollectionUtils.isEmpty(winningRecordDOList)){
            logger.info("中奖列表为空，不用发邮件！");
            return;
        }
        for (WinningRecordDO winningRecordDO : winningRecordDOList){
            //Hi，胡一博。恭喜你在抽奖活动活动中获得二等奖：吹风机。获奖奖时间为18：18:44,请尽快领取您的奖励
            String context="Hi，"+winningRecordDO.getWinnerName()+"。恭喜你在"
                    + winningRecordDO.getActivityName() + "活动中获得"
                    + ActivityPrizeTiersEnum.forname(winningRecordDO.getPrizeTier()) .getMessage()
                    +"："+winningRecordDO.getPrizeName()+"。获奖时间为"
                    + DateUtil.formatTime(winningRecordDO.getWinningTime())+"，请尽快领 取您的奖励！";
            mailUtil.sendSampleMail(winningRecordDO.getWinnerEmail(),
                    "中奖通知",context);

        }
    }

    /**
     * 发短信
     * @param winningRecordDOList
     */
    private void sendMessage(List<WinningRecordDO> winningRecordDOList) {
        if (CollectionUtils.isEmpty(winningRecordDOList)){
            logger.info("中奖列表为空，不用发短信！");
            return;
        }
        for (WinningRecordDO winningRecordDO : winningRecordDOList){
            Map<String, String> map = new HashMap<>();
            map.put("name", winningRecordDO.getWinnerName());
            map.put("activityName", winningRecordDO.getActivityName());
            map.put("prizeTiers", ActivityPrizeTiersEnum.forname(winningRecordDO.getPrizeTier()).getMessage());
            map.put("prizeName", winningRecordDO.getPrizeName());
            map.put("winningTime", DateUtil.formatTime(winningRecordDO.getWinningTime()));
            smsUtil.sendMessage("SMS_465985911",
                    winningRecordDO.getWinnerPhoneNumber().getValue(),
                    JacksonUtil.writeValueAsString(map));
        }

    }

    /**
     * 状态扭转
     * @param param
     */
    private void statusConvert(DrawPrizeParam param) {
        ConvertActivityStatusDTO convertActivityStatusDTO = new ConvertActivityStatusDTO();
        convertActivityStatusDTO.setActivityId(param.getActivityId());
        convertActivityStatusDTO.setTargetActivityStatus(ActivityStatusEnum.COMPLETED);
        convertActivityStatusDTO.setPrizeId(param.getPrizeId());
        convertActivityStatusDTO.setTargetPrizeStatus(ActivityPrizeStatusEnum.COMPLETED);
        convertActivityStatusDTO.setUserId(
                param.getWinnerList()
                        .stream()
                        .map(DrawPrizeParam.Winner::getUserId)
                        .collect(Collectors.toList())
        );
        convertActivityStatusDTO.setTargetUserStatus(ActivityUserStatusEnum.COMPLETED);
        activityStatusManager.hadlerEvent(convertActivityStatusDTO);
    }

}
